14 STORRS AGRICULTURAL EXPERIMENT STATION. 
Report of the Department of Dairy Bacteriology. 

To the Director of Storrs Agricultural Experiment Station: 
Sir:—During the last year a very large amount of work 
upon the problems of dairy bacteriology has been carried on in 
the laboratory of the Station. "This work has been under my 
general direction but carried on conjointly with W. A. Stock- 
ing, Jr., and W. M. Esten, as indicated in the following articles. 
The general purpose of the work undertaken has been to obtain 
further information concerning the species of bacteria especially 
related to dairy problems. ‘The study of numbers of bacteria 
in milk and its products under various conditions has been 
carefully pursued for years, until there seems to be little chance 
for much further important information to be obtained along 
these lines. Hitherto, however, very little has been done upon 
the species of bacteria developing in milk under various condi- 
tions. It is therefore manifest that the problems of dairy bac- 
teriology must concern themselves, in the future, with sfeczes 
rather than simple zzmders. As pointed out in the report of 
1901, a method for the direct qualitative analysis of milk bac- 
teria has been devised in our laboratory, and the work of the 
last year has been the application to various dairy problems of 
the methods devised. 
The work reported in the following pages ‘included two 
somewhat distinct series of articles. The first series with Mr. 
Stocking has involved the study of three questions: 
1. The numbers and chief types of bacteria which are found 
in milk obtatned under different conditions. 
2. ‘The number and chief types of species that are present 
in milk which has been treated by azfferent dairy methods. 
3. The number and chief types of bacteria that are present 
in milk at various intervals when kept at different temperatures. 
